Segment Information - Reconciliation of U.S. GAAP (Loss) Income Before Income Taxes to Adjusted EBITDA (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting [Abstract]
Adjusted EBITDA	$ 16,440,000	$ 9,496,000	$ 63,030,000	$ 46,456,000
Stock-based compensation expense	(21,200,000)	(10,648,000)	(39,814,000)	(20,296,000)
Interest expense	(700,000)	(2,988,000)	(1,285,000)	(5,961,000)
Depreciation and amortization	(8,133,000)	(6,494,000)	(15,819,000)	(13,180,000)
Restructuring expense	0	(1,732,000)	0	(5,078,000)
Special adjustments, interest income and other	(16,282,000)	79,000	(17,929,000)	173,000
(Loss) income before income taxes	$ (29,875,000)	$ (12,287,000)	$ (11,817,000)	$ 2,114,000